diff --git a/Makefile b/Makefile
index 884b59dc06..88bce561a8 100644
--- a/Makefile
+++ b/Makefile
@@ -112,7 +112,8 @@ endif
 -include $(SUBDIR_DEVICES_MAK_DEP)
 
 %/config-devices.mak: default-configs/%.mak
-	$(call quiet-command,$(SHELL) $(SRC_PATH)/scripts/make_device_config.sh $@.tmp $<, "  GEN   $@.tmp")
+	$(call quiet-command, \
+            $(SHELL) $(SRC_PATH)/scripts/make_device_config.sh $< $*-config-devices.mak.d $@ > $@.tmp, "  GEN   $@.tmp")
 	$(call quiet-command, if test -f $@; then \
 	  if cmp -s $@.old $@; then \
 	    mv $@.tmp $@; \
diff --git a/scripts/make_device_config.sh b/scripts/make_device_config.sh
index 7958086132..c1afb3ffaa 100644
--- a/scripts/make_device_config.sh
+++ b/scripts/make_device_config.sh
@@ -1,10 +1,12 @@
 #! /bin/sh
-# Construct a target device config file from a default, pulling in any
-# files from include directives.
+# Writes a target device config file to stdout, from a default and from
+# include directives therein.  Also emits Makefile dependencies.
+#
+# Usage: make_device_config.sh SRC DEPFILE-NAME DEPFILE-TARGET > DEST
 
-dest=$1
-dep=`dirname $1`-`basename $1`.d
-src=$2
+src=$1
+dep=$2
+target=$3
 src_dir=`dirname $src`
 all_includes=
 
@@ -22,7 +24,7 @@ while [ -n "$f" ] ; do
   [ $? = 0 ] || exit 1
   all_includes="$all_includes $f"
 done
-process_includes $src > $dest
+process_includes $src
 
-cat $src $all_includes | grep -v '^include' > $dest
-echo "$1: $all_includes" > $dep
+cat $src $all_includes | grep -v '^include'
+echo "$target: $all_includes" > $dep